Mechanical seal.



Wnws as F. P. PFLEGHAR. MBCHANIUAL SEAL. I APPL'IGATION FILED 11.13,190.2,

Patented Apr. 27,1909.

THE NORRIS PETERS 9a., WASHINGTON, o. c.

FRANK r. .PELEGHAR, OFnEw'HAvEN, CONNECTICUT.

MECHANICAL SEAL.

Specification of Letters Patent.

Patented April 27, 1909.

Application filed. March 13, 1908. Serial No. 420,835.

To all whom it may concern:

Be it known that I, FRANK P. PFLEGHAR, a citizen of the United States,and resident of New Haven, in the county of New Haven and State ofConnecticut, have invented "a new and useful Improvement inilVIechanicalSeals, of which the following is a specification. 7

My invention relates to a mechanical seal with the object in view ofproviding a simple and effective seal of this character.

A practical embodiment of my invention is represented in theaccompanying drawings, in which- Figure 1 is a view of the seal in sideelevation showing in full lines the positions the parts occupy when theseal is locked and in dotted lines the position which the shackle mayassume before it is locked, Fig. 2 is a section through the casing takenedgewise and showing the locking spring and locked end of the shackle intop plan as Well as the retaining ledge for holding the spring out oflocking position, Fig. 3 is a section through the casing and partstherein in the plane of the line AA of Fig. 2, Fig. 4 is a sectionthrough the casing, similar to that shown in 'Fig. 2, but showing thelocking spring out of locking engagement, Fig. 5 is a plan view indetail of the free or looking end of the shackle, Fig. 6 is a section inthe plane of the line BB of Fig. 4, Fig. 7 is an edge view indetail ofthe locking spring, and Fig. 8 is a top plan view of the same.

The part of the shackle which is permanently secured to thecasing isdenoted by 1 and the part which is to be inserted and locked within thecasing in adjusting the seal for use, is denoted by 2.

The 1part 2 is provided with openings 3 and 4, in t e presentinstance-out oftransverse alinement for the urpose of receiving thehooked ends of the ocking spring.

The casing is denoted by 5 and may be made from a single piece of sheetmetal'properly stamped into a flattened elongatedform with its upper andlower surfaces struck outwardly to furnish room for the play of theoperating arts. I

I have s own, within the casing 5, a plate 6 which may be provided-withan elongated opening 7 and maybe folded at its forward end toward themouth of the casing to form a ledge 8 for temporarily holding one branchof the locking spring out of locking osition and for the purpose ofretaining t c said locking spring against any unintentional displacementduring the handling of the seal before its use, I prefer to provide theledge 8 with depressions or corrugations 9.

v The locking spring consists of an irregular. U-shaped piece of springmetal, the branches 10 and 11 of whichproject in the same generaldirection from the bight 12 but are not opposite one another, the branch11 being located toward one edge or side of the casing 5 and adapted tospring through the o ening 7 in the ledge plate 6 while the branc 10 isnear the opposite edge or side of the casing.

The free ends of the branches 10 and 11 are provided with hookedportions 13, 14, directed inwardly and these hooked portions are adaptedto rest before the seal is used in the position shown in Fig. 6, thehook 13 resting on the corrugated portion of the ledge 8 and the hook 14resting on the ledge plate 6 in proximity to the end of the opening 7.

The opening 15 at the end of the casing is made just wide enough toreceive therein the two parts 1 and 2 of the shackle and the part 2 ofthe shackle is intended to slide along the part 1 between the endsof thehook portions 13, 14, of the spring until it reaches the bight 12 of thelocking spring when its end will engage within the bight 12 and thefurther inward push on the part-2 of the shackle will slide the lockingspring bodily along within the casing relieving the hook 13 from itssupporting ledge and the hook 14 from its supporting ledge andpermitting these hooks to pass through the openings in the end 2 of theshackle, the hook 13 passing through the opening 4 and the hook 14passing through the opening 3 as clearly shown in Figs. 2 and 3. Thesehooks having once been permitted to spring toward one another and adjustthemselves in the openings 3 and 4, the end 2 ofthe shackle ispermanently locked within the casing against any possibility ofdisplacement save by distortion or breaking of theparts, which can' bereadily observed by the eye of the inspector.

Any attempt to draw the spring piece forward after it is once engagedwith the end 2 of the shackle is prevented by the engagement of theouter face of the hook 13 with the end of the ledge piece 8 and theouter end of the hook 14 with the end wall of the open- A mechanicalseal comprising a suitable I being adapted to enter the casing betweencasing, a spring having a general UEshape, the hooked branches of thelocking spring to the branches of said spring being of different slidethe spring bodily within the casing, lengths and laterally offset fromeach other thereby forcing the spring out of its nonand provided withhooked ends, the hooked lockin portions of the ends extending inopposite l directions, means for retaining the said i engaging theshackle. spring within the casing with the hooked l In testimony, that Iclaim the foregoing as ends of its branches separated and retained myinvention, I have signed my name in its locking position with bothhooked ends against unintentional displacement, and a presence of twowitnesses, this ninth day of 3,5

shackle having one end permanently secured M arch, 1908. to the casingand the other end provided with a plurality of perforations out of transl \Vitnesses: verse alineinent for receiving the hooked MAE D. CONATY,

ends of the spring, the said perforated end FRANCES I. MARTIN.

FRANK P. PFliEGl-IAR.

position and permitting it to occupy an

